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City of Arden Hills March 2008 Table 7 - Summary of T voicallll Source, Investiaation Procedures, and Rehabilitation Options Infiltration Potential Source Investigative Procedures Rehabilitation Options or Inflow Inflow Manhole Covers Smoke Test Replace Cover Physical Survey Raise Cover Seal Cover Rim Area Inflow Area Drains Smoke Test Re-route flow to storm sewer or surface discharoe Inflow Roof Drains Building Inspeaion Re-route flow to storm sewer or surface Smoke Test discharge Dve Test Infiltrationl Deteriorated Adjustment Manhole Inspeaion Replace rings and seal Inflow Rings Install sealing product (Chimney seal, Infi- shield) Infiltrationl Sump Pump Connection Basement Inspection He-route discharge out of basement ~o Inflow surface Infiltrationl Direct Foundation Drains TV inspection of service pipe Re-route to sump pump and discharge Inflow outside basement to surface .- Infiltrationl l1'aking Service pipe TV inspection of service pipe Replace service pipe Inflow Install CIPP liner Infiltration Manhole wall seepage Manhole Inspection Grout Injection Replace Manhole Install Manhole liner Infiltration Pipe Joint leakage Televise sewer main Joint Grouting C1PP lining Pipe Replacement In the service areas for meters M 1, M2, and M054, initial investigation efforts should be focused on possible private property type sources. Investigation should include sump pump surveys of individual properties and televising individual service lines during wet conditions. Some communities have had reasonable success televising the service lines from the main sewer using a remote camera. This process is less expensive and significantly less intrusive than attempting to televise services from the basement of a property. In consideration of the potential problems with basement access, we would recommend attempting to televise several service lines in several areas of these service areas to test the procedure and view the results prior to widespread implementation of a program. Since sump pump inspections can be a difficult project and the cost implications can be significant, the progr<lm should be implemented throughout the entire community with priority areas defined by the identified inflow areas. In the service areas for meters M3, M051,M052, and M059, initial investigative efforts should be focused on direct inflow sources, with smoke testing, physical survey of manholes, roof leader inspections, and dye testing as necessary. Manholes located in roadside ditch areas such as those repaired along Hwy 10 can be a significant source of inflow and all manholes located on easements or off paved road areas should be inspected for flooding potential and damaged rings. Sump Pumps are also considered a direct inflow source and they will generate a significant flow spike so a survey in these areas will provide some useful information as well as providing a "complete" inspection. Inflow defects that are identified should be repaired as soon as feasible after identification to reduce the inflow as much and as quickly as possible. This will reduce the MCES treatment charges as well as assist in further evaluation of the system since other defects may become evident when some of the flow is removed. These investigation recommendations are a starting point and problems identified or defects noted may require additional investigation or other unique investigative techniques. The results of each procedure should be reviewed <lnd evaluated to determine the next step in the investigative effort. Pagel00fl2